package cdu.sl.interceptor;


import cdu.sl.filter.TokenFilter;
import cdu.sl.utils.JwtUtils;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

//@Component
public class TokenInterceptor implements HandlerInterceptor {

    private static final Logger log = LoggerFactory.getLogger(TokenFilter.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 1.获取请求路径
        String requestURI = request.getRequestURI();

        // 2.判断是否有登录请求 , 如果路径当中包含/login , 说明这是登录操作 , 放行
        if (requestURI.contains("/login")) {
            log.info("登录请求 , 放行");
            return true;
        }

        // 3.获取请求头中的token
        String token = request.getHeader("token");


        // 4.判断token是否存在 , 如果不存在 , 说明未登录 , 返回错误信息(响应401状态码)
        if (token == null || token.isEmpty()) {
            log.info("token为空,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }

        // 5.如果token存在 , 校验令牌 , 如果校验失败 -> 返回错误信息(响应401状态码)
        try {
            JwtUtils.parseToken(token);
        } catch (Exception e) {
            log.info("令牌非法,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }

        // 6.校验通过 , 放行
        log.info("token校验通过,放行");
        return true;
    }
}
